LG SIGNATURE R User Manual page 112

following. There may not be a problem with the product.
First of all, perform a
Self-diagnosis to check for any abnormalities in the TV.
If you are using a set-top box, turn it off, and then turn it back on.
Make sure that the set-top box is correctly connected to your TV.
It says there is no signal on the screen.
Check whether the coaxial cable or the cable connected to the external device is properly
connected to the TV.
Go to to choose the connected input.
Check if your external device, such as set-top box or Blu-ray player, is turned on.
I cannot see some channels.
Launch
If you are using a set-top box, consult its supplier.
The screen is cut off.
Go to
The screen shakes after the momentary appearance of vertical/horizontal lines and
net pattern.
Connect wireless telephones, hairdryers, electrical drills, etc. to a different power outlet.
The problem may be caused by high-frequency electronic devices such as another TV or
strong electro-magnetic sources nearby.
Each channel has a different image quality.
Depending on the type of videos provided by the broadcasters, channels may have
different image qualities.
If you are using a set-top box, consult its supplier.
Screen Self-diagnosis
Run
broadcast signal.
Support OLED Care Device Self Care Screen
General Channels Channel Tuning Auto Tuning
Picture and change the
first. If it is normal, there may be a problem with the
Aspect Ratio .
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